Wood laminating press



Jan. 30, 1968 'r. R. DRAKE WOOD LAMINATING PRESS 2 Sheets-Sheet 1 INVENTOR TAeoa areRpnaA e BY "y M fi/iorney Filed June 17, 1965 Jan. 30, 1968 -r. R. DRAKE I 3,366,037

W001) LAMINATING PRESS Filed June 17, 1965 2 Sheets-Sheet 2 I INVENTOR. flea a o reRD/zfe United States Patent ()fiice 3,3bhfi37 Patented .lana 30, teen 3,366,037 Wt-OQD LAMINATHNG PRESS Theodore R. Drake, 178i) Crestview Ave., Seal Beach, Calif. 90740 Filed June 17, 1965, Ser. No. 464,801 6 Claims. (Cl. 100-93) ABSTRACT OF THE DllSiILOSURE A wood laminating press including an elongate horizontally disposed carrier polygonal in cross-section and defining a plurality of radially outwardly disposed, fiat, longitudinal work engaging sides, outwardly projecting work engaging stop means along one edge of each side of the carrier, a plurality of longitudinally spaced work engaging hydraulic cylinder and ram units along the other edge of each side and disposed laterally inwardly toward and opposing the stop means, an elongate perforated tubular central axle extending longitudinally through and projecting from the opposite ends of the carrier, support means adjacent each end of the carrier and rotatably engaged with the ends of the axle to rotatably support the carrier, drive means at one end of the axle and operable to intermittently selectively rotate the carrier a distance equal to the circumferential extent of one side of the carrier and fluid supply means to selectively deliver fluid under pressure to and to exhaust fluid from the cylinder and ram units related to each side of the carrier, heating means for heating the carrier and the work and including a hot air furnace remote from the carrier and connected with one end of the axle.

This invention has to do with an improved wood laminating press and is more particularly concerned with a rotary or revolving press for laminating wood slabs and adapted to handle and establish a plurality of slabs simultaneously and continuously.

It is an object of this invention to provide an improved, revolving, wood laminating press adapted to intermittently receive stacks of glued boards, assembled to establish a slab and to hold of each said stacks in tight clamped engagement for a predetermined period of time and to permit the glue applied thereto to set and cure and to intermittently discharge finished laminated wood slabs.

It is another object of this invention to provide a press of the character referred to having an elongate polygonal carrier with work supporting meansat each side thereof to engage a stack of wood and hydraulic ram units related to said support means to hold the stacks of wood in tight clamped engagement for predetermined periods of time.

It is a further object of my invention to provide a press of the general character referred to having means for rotating the polygonal carrier so that the sides of the carrier with which the last slab to be cured is disposed downwardly, whereby the finished slab may be discharged by releasing the hydraulic ram units related to it and permitting the slab to drop from engagement with the carrier.

It is yet another object of this invention to provide a press of the character referred to which is such that each time the carrier is rotated to discharge a slab, another side of the carrier, from which a slab has previously been discharged is positioned to occur in a vertical plane at one side of the carrier and in position to receive a new, prepared, charge or stack of wood.

Another object of my invention is to provide a press of the carrier referred to having novel heating means to heat the work and cure the glue.

Yet another object of this invention is to provide a press of the character referred to including planing means to plane or dress the slabs as they are discharged from the carrier.

It is an object of my invention to provide a wheeled truck having a slab supporting top surface or bed and a planing head at one end of the bed, which truck is adapted to be advanced beneath the carrier to plane the downwardly disposed surface of a slab carrier by the carrier and to stop its position beneath the carrier to receive and support the slab when the slab is released by the carrier.

It is a further object of the present invention to provide a second planing head in fixed position at one end of the carrier to engage and plane the top surface of the slab deposited on the truck, when the truck, with the slab thereon, is moved or shifted from beneath the carrier.

The various objects and features of my invention will be fully understood from the following detailed description of a typical preferred form and application of my invention, throughout which description reference is made to the accompanying drawings, in which:

FIG. 1 is a side elevational view of my new press;

FIG. 2 is a view taken substantially as indicated by line 2-2; of FIG. 1;

FIG. 3 is a view similar to FIG. 2 showing the parts of my construction in another position;

FIG. 4 is a View similar to FIGS. 2 and 3 showing the parts in yet another position;

FIG. 5 is a view taken substantially 5-5 on FIG. 3;

FIG. 6 is a view taken substantially as indicated by line 66 on FIG. 4;

FIG. 7 is an isometric view of a portion of the construction that i provide;

FIG. 8 is a view taken substantially as indicated by line -55 on FIG. 7;

FIG. 9 is a view taken substantially as indicated on line 99 on FIG. 8; and

FIG. 10 is an isometric view of a portion of the construction that I provide.

The press that I provide includes an elongate work carrier C, square in cross-section and made up of a plurality of longitudinally spaced, open, square, frame units 10 arranged in axial alignment and secured together in fixed longitudinally spaced relationship by means of angle iron stringers 11 extending longitudinally of the carrier and seated in the inside corners of the frame units. The frame units and stringers are fixed to each other by welding.

The frame units ill at each end of the carrier are provided with end plates 12 which plates close the ends of the carrier.

An elongate, central, longitudinally extending tubular axle A is arranged within the carrier and has end portions pro ecting through and beyond the end plates 12 at each end of the carrier to facilitate rotatably supporting the carrier, as will hereinafter be described.

Each of the several frame units 10 is made up of four elongate channel sections 14, each defining one side of the unit and having end portions which project outwardly and beyond the sides of the unit to establish a plurality of longitudinally spaced, outwardly projecting work supporting stops 35, along each side edge of each side of the carrier. Suitable triangular shaped gusset plates 16 are fixed to and extend between the adjacent stops of related sections 14 and serve to reinforce the stops and the overall strength and rigidity of the carrier, as clearly illustrated in FIGURES 7 through 10 of the drawings.

Each side of the carrier is provided with a flat side plate 17 engaged on and supported by the outwardly disposed sides or flanges of the channels 14, at each side of the frame. The plates 17 extend from one end of the carrier to the other and between the stops 15 at each side of the carrier.

From the foregoing, it will be apparent: that the carrier C is an elongate, substantially closed, box-like polygonal as indicated by line unit having a plurality of elongate longitudinall spaced outwardly projecting stops along the opposite side edges of each side of the carrier and having a central, tubular axle member extending longitudinally throu h and projecting from the opposite ends thereof.

The stops 15 are rail like extensions of the channels 14- of the frame units and are disposed so that the gusset plates 16 related thereto close the ends of the channels whereby the stops are in the nature of gusseted box sections.

Since the side plates 17 are not coextensive with the lateral extent of their related sides of the carrier, but stop or terminate at the stops 15, the longitudinal corners of the carrier are opened and are such that air, introduced into the carrier through the axle A, as will hereinafter be described, will flow out through the corners of the carrrer.

A hydraulic cylinder and ram unit U is related to and arranged between every other pair of related stops along one side edge of each side of the carrier C and is disposed to direct and exert pressure laterally onto a stack of boards or work W arranged between the stops related to said side of the carrier. The units U are arranged so that they are directed counter to the direction of rotation of the carrier and so that when the side of the carrier to which they are related, is in a vertical plane and a stack of boards or work is related to that side of the carrier and is supported by the stops at the lower side edge of that side of the carrier, the cylinder and ram units act downwardly to establish pressure engagement on the top or upper edge of the stack of wood or work W. In FIGURE 8 of the drawings, the arrow X, directed counter clockwise, indicates the direction of rotation of the carrier and the units U are shown disposed counter clockwise.

Referring to FIGURE 10 of the drawings, each cylinder and ram unit U includes an elongate cylinder 29 having inner and outer ends 21 and 22. The inner end portion of the cylinder is threaded and carries two pairs of clamp rings 23, which rings serve to engage and hold a pair of axially spaced, apertured, mounting plates 24. The mounting plates 24 engage and establish clamped engagement on the opposite, or inner and outer sides of the pair of stops 15 with and between which the unit is related. In practice, a clamp bolt 25 can be provided to extend between the plates 24 to lock the plates in position on their related stops.

The units U further include elongate rams 26 slideably engaged in the cylinders to project longitudinally inwardly from the cylinders. The rams 26 are provided with work engaging pads or plates 27 at their inner ends.

The units U can be single acting or double acting cylin der and ram units, as desired. In the case illustrated, I have shown the units as single acting, spring loaded type units each having a single fluid inlet and outlet port 28 in the outer end portion of the cylinder and supplied with fluid by a single fluid line 29 engaged in said port. The units are such that when fluid, under pressure, is introduced into the cylinders, the rams are urged longitudinally outwardly therefrom and such that when the fluid pressure is released, a spring (not shown) within the cylinder, urges the ram longitudinally inwardly and into the cylinder.

In practice, the plates 24 can be welded to the cylinders 24 in fixed position thereon, without departing from the spirit of the invention.

It will be apparent that the units U are such that they can be easily and conveniently slid into and out of engagement on or with their related stops 15, for the purpose of servicing the units, varying the number of units required or desired, or for the purpose of adjusting the position of the units relative to the plane of their related sides of the carrier.

In the preferred carrying out of my invention and as illustrated in the drawings, elongate caul boards 30 are arranged adjacent each side of the carrier to extend longitudinally thereof and to occur between the pads 27 of the units U and the work. In practice, the caul boards 30 are fixed to and carried by the pads 27, as by means of suitable screw fasteners 31.

My construction further includes similar caul boards 32 related to and carried by the stops 15 at the other side edges of the carrier and opposing the caul boards 3%.

Supports S are provided at the opposite ends of the carrier C to rotatably support the carrier. The supports 8 are simple A-fran1e type structures arranged on planes extending transverse the longitudinal axis of the carrier and are provided with pillow blocks 35 at their apex to rotatably receive and support the ends of the axle A as clearly illustrated in FIGURES 1 and 7 of the drawings.

A suitable drive means M carried by the support means S at the rear end of the carrier and related to the rear end of the axle A is provided to rotate the carrier C. The means M serves to rotate the carrier, intermittently, onequarter of a revolution at a time and is shown as including a ring gear 36 on the axle A, a motor 37 carried by the support S and a reduction gear 38 between the motor and the ring gear 36. The motor is under control of a suitable switching means (not shown), which switching means may be automatically or manually operated, as circumstances require or as desired.

The means M may also include suitable indexing means, either electrical or mechanical, to stop the carrier in desired, predetermined rotative positions, each time the carrier is rotated.

Since the switching and indexing means mentioned above can vary widely in form, without departing from the spirit of the invention and since these particular means in no way affect the novelty of this invention, I have not illustrated such means and will not unduly burden this specification with further detailed consideration and description thereof.

A fluid supply means F is provided to supply fluid, under pressure, to the several ram and cylinder units U related to each side of the carrier, upon demand, and to release said fluid pressure upon demand.

The means F is shown as including a log line 4% extending longitudinally along each row or bank of ram and cylinder units U and connected with the lines 29 extending therefrom. The ends of the log lines at the rear end portion of the carrier extend radially inwardly, through the adjacent open corners of the carrier and thence into and through the axle A, through suitable openings provided therein (not shown).

A suitable multiple (4) flow passage fluid conducting swivel fitting 41 is coupled to the rear end of the axle A and enters the axle to connect with the four log lines 40. The fitting 41 has four flow ports at the exterior of the axle, which ports connect with flow lines 4-2. The flow lines 42 are under control of two-way valves 43, which valves are connected with a supply line 44 and a return line 4-5. The supply line 44 receives fluid, under pressure, from a suitable pump 46 and the return line 45 connects a suitable reservoir 47, from which the pump draws lll The valves 43 can be manually operable or can be automatically operated, as circumstances require, or as desired.

With the means F set forth above, it will be apparent that the several banks or rows of ram units can be selectively energized or actuated and de-energized or deactuated, as circumstances require and upon demand.

In the construction that I provide, further includes finishing means for dressing and planing the top and bottom surfaces of the finished laminated slabs and removing the slabs from engagement with the carrier. The finishing means is shown as including a pair of rails 59 extending longitudinally below the carrier and extending forwardly therefrom. The rails extend between the legs of the foremost support S. The said means further includes a work supporting wheeled carriage SI, equal or greater in longitudinal extent than the carrier and having a bed with a flat upwardly disposed work supporting top surface 512. The top surface 52 is adapted to occur in spaced relationship below the lowermost, downwardly disposed side of the carrier and below the work W supported thereby, when the carriage is positioned below the carrier.

The carriage is provided with two or more pairs of rail engaging wheels 53 and is preferably power driven, as by means of an electric motor 54 related to one of the pairs of supporting wheels.

The carriage is further provided with a horizontally disposed planing head 55 extending transverse the rear end of the bed of the carriage, with its uppermost portion occurring in a horizontal plane spaced a predetermined distance above the top surface 52 of the carriage bed and above the lower plane of the work W at the bottom or underside of the carrier. The planing head is driven by an electric motor n carried by the bed, at one end of the head.

With this relationship of parts, it will be apparent that as the carriage is advanced rearwardly, from a position forward of the carrier, as shown in FIGURE 1 of the drawings, to a position beneath the carrier, as illustrated in FIGURES 3 and 5 of the drawings, the lower or underside of the work W, at the bottomside of the carrier, is planed smooth and uniformly.

This planing action is performed while the work is still held in ti ht clamped and fixed relationship in the carrier.

A second, horizontally disposed, top planing head 60, driven by a motor 61, is carried by the forward support S to extend transverse the longitudinal axis of the construction with its lower portion on a horizontal plane spaced a predetermined distance above the top 52 of the carried bed and below the unfinished top plane of the work W, after the bottom of the work has been finished and the work has been released by the carrier and. allowed to drop onto the top of the carriage. With this construction, it will be apparent that after a piece of work W has been planed by the planing head 55 on the carriage and has been deposited on the top of the carriage bed, by deactuating the ram units rented thereto, and as the car riage, with the work W thereon, is withdrawn from engagement below the carrier, the top surface of the work is suitably planed and finished, as clearly indicated in FIGURES 4 and 6 of the drawings.

It will be apparent that when a piece of work has been released by the carrier C, as set forth above, the side of the carrier with which the piece of work was related, is empty and can be advanced to occur in a vertical plane, ready to receive a new stack of boards, or work W, by rotation of the carrier, clockwise, one-quarter revolution.

In practice, a suitable loader means L is provided at the left hand side of the carrier C, which loader means has a laterally shiftable support member '70, the top surface '71 of which is on a plane common with the upwardly disposed surface of the caul boards 32 when said caul boards are at the left side of the carrier and upon which the boards employed to establish the work W can be advantageously stacked and assembled.

The loader means L further includes a vertical, laterally inwardly disposed and laterally shiftable backing member 72 against which the work W is engaged and rested and which is operable to shift the work laterally inwardly, off of or out of engagement on the member 'Fll and onto or into engagement on the caul board 32, related thereto.

The member 70 is shiftable laterally outwardly and away from the carrier to facilitate rotation of the carrier and to facilitate loading the loading means with a new stack of work.

The opposing surfaces of the several pieces of wood stacked and assembled to establish the work W are suitably painted or otherwise provided with a coating of glue when and as they are assembled on the loading means L and before the work is engaged in and by the carrier.

In addition to the foregoing, the press that I provide includes heating means H for heating the work and curing the glue. The means H is shown as including a hot air furnace positioned at one side and forward of the carrier, a duct 81 extending from the furnace to the forward open end of the axle A, a swivel coupling 82. connecting the duct 81 with the said forward open end of the axle, a plurality of longitudinally and circumferentially spaced exhaust ports 83 in the axle A, communicating with the interior of the carrier and a heat insulated hood 84 extending longitudinally between the supports S at the opposite ends of the carrier and about the top and right hand side of the carrier, as clearly illustrated in FIGURES 1 through 4 of the drawings.

Hot or heated air issuing from the furnace Si) is directed and flows into the interior of the carrier, where it heats the plates 17, which plates, in turn, heat the adjacent portions of the work related thereto. The heated air then flows out through the corners of the carrier, as indicated above, into the confines of the hood 84 and serves to heat the outer or exposed portions of the work, while the work is at the top and right side of the carrier, The heated air in the hood is continually displaced by advancing heated air and spills from within the confines of the hood, as it cools.

In practice, the heating means H is such that it will heat the work and cure the glue in about one-half the time it takes to assemble and set up a new batch of glued Wood on the loader means L and to finish and remove a finished slab from the construction. Since two loaded sides of the carrier are subjected to the full effect of the heating means at all times, it well be apparent that my press will or can be operated substantially continuously and it is not necessary to stop work and cause men to stand idle, waiting for the glue to set up.

In practice, if greater time is required, to heat the work and cure the glue, a similar press construction with a carrier having five, six or more sides can be established, in which case, the loaded sides are subjected to the effect of the heating means through a greater number of cycling periods and therefore, for a prolonged or greater period of time.

It is to be understood that the period of time required and the temperature that must be obtained to heat the wood and set the glue depends upon the thickness of the slab or slabs to be established and the particular kind and/or type of glue that is employed. Accordingly, for the most satisfactory and efficient operation of my new press construction, a glue having a suitable curing time and/ or temperature should be selected and employed.

Having described only a typical preferred form and application of my invention, I do not wish to be limited to the specific details herein set forth, but wish to reserve to myself any modifications and/or variations that may appear to those skilled in the art and which fall within the scope of the following claims.

Having described my invention I claim:

1. A wood laminating press of the character referred to including an elongate horizontally disposed carrier polygonal in cross-section and defining a plurality of radially outwardly disposed, flat, rectangular longitudi nally extending work engaging sides about a horizontal axis, longitudinally spaced work engaging stop means along one longitudinal side edge of each side of the carrier and projecting outwardly and normal to the planes of their related sides, a plurality of longitudinally spaced work engaging hydraulic cylinder and ram units along the other longitudinal side edge of each side on axes parallel with and spaced radially outward from their related sides and disposed laterally inwardly toward and opposing the stop means, a central horizontal axle extending longitudinally through and projecting from the opposite ends of the carrier, support means adjacent each end of the carrier and rotatably engaged with the ends of the axle to rotatably support the carrier, drive means at one end of the axle and operable to intermittently selectively rotate the carrier a distance equal to the circumferential extent of one side of the carrier and fluid supply means to selectively deliver fluid under pressure to and to exhaust fluid from the cylinder and ram units related to each side of the carrier.

2. A wood laminating press of the character referred to including an elongate horizontally disposed carrier polygonal in cross-section and defining a plurality of radially outwardly disposed, fiat, longitudinal work engaging sides, outwardly projecting work engaging stop means along one edge of each side of the carrier, a plurality of longitudinally spaced work engaging hydraulic cylinder and ram units along the other edge of each side and disposed laterally inwardly toward and opposing the stop means, a central axle projecting from the opposite ends of the carrier, support means adjacent each end of the carrier and rotatably engaged with the ends of the axle to rotatably support the carrier, drive means at one end of the axle and operable to intermittently selectively rotate the carrier a distance equal to the circumferential extent of one side of the carrier and fluid supply means to selectively deliver fluid under pressure to and to exhaust fluid from the cylinder and ram units related to each side of the carrier, said fluid supply means includin a multiple fluid passage fluid handling swivel coupling carried by one end of the axle, fluid lines extending between the cylinder and ram units related to each side of the carrier to related fluid passages of the swivel coupling, flow lines related to the cylinder and ram units at each side of the carrier and connected with related flow passages of the fluid coupling and extending to a station remote from the carrier, valve means related to the flow lines to direct fluid to and from the cylinder and ram units, a fluid reservoir remote from the carrier, a fluid pump remote from the carrier and connected with the reservoir, a delivery line from the pump to the valve means and a return line from the valve means to the reservoir.

3. A wood laminating press of the character referred to including an elongate horizontally disposed carrier polygonal in cross-section and defining a plurality of outwardly disposed, flat, longitudinal work engaging sides, outwardly projecting stops along each edge of each side of the carrier, a plurality of longitudinally spaced work engaging hydraulic cylinder and ram units carried by the stops along one edge of each side and disposed laterally inwardly toward and opposing the stop means along the other edge of each side, a central axle projecting from the opposite ends of the carrier, support means adjacent each end of the carrier and rotatably engaged with the ends of the axle to rotatably support the carrier, drive means at one end of the axle and operable to intermittent ly and selectively rotate the carrier a distance equal to the circumferential extent of one side of the carrier, and fluid supply means to selectively deliver fluid under pressure to and to exhaust fluid from the cylinder and ram units related to each side of the carrier, said fluid supply means including a multiple fluid passage fluid handling swivel coupling carried by one end of the axle, fluid lines extending between the cylinder and ram units related to each side of the carrier to related fluid passages of the swivel coupling, flow lines related to the cylinder and ram units at each side of the carrier and connected with related flow passages of the fluid coupling and extending to a station remote from the carrier, valve means related to the flow lines to direct fluid to and from the cylinder and ram units, a fluid reservoir remote from the carrier, 21 fluid pump remote from the carrier and connected with the reservoir, a delivery line from the pump to the valve means and a return line from the valve means to the reservoir.

4. A wood laminating press of the character referred to including an elongate horizontally disposed carrier polygonal in cross-section and defining a plurality of elongate, radially outwardly disposed, flat, longitudinal work engaging sides, a plurality of lon itudinally spaced stops along each edge of each side of the carrier and projecting outwardly and normal to the planes of their re lated sides, stop means carried by the stops along one edge of each side, a plurality of longitudinally spaced work engaging hydraulic cylinder and ram units carried by the stops along the other edge of each side and disposed laterally inwardly toward and opposing the stop means along the said one edge of each side, a central axle projecting from the Opposite ends of the carrier, support means adjacent each end of the carrier and rotatably engaged with the ends of the axle to rotatably support the carrier, drive means at one end of the axle and operable to intermittently and selectively rotate the carrier a distance equal to the circumferential extent of one side of the carrier, and fluid supply means to selectively deliver fluid under pressure to and to exhaust fluid from the cylinder and ram units related to each side of the carrier, said stop means including a caul board supported by the stops along said one edge of each side of the carrier, said cylinder and ram units including elongate cylinders arranged between and carried by adjacent pairs of stops on their related edges of the sides of the carrier, and elongate laterally inwardly projecting rams with work engaging pads at their inner ends slideably engaged in and projecting laterally inwardly from the cylinders.

5. A wood laminating press of the character referred to including an elongate horizontally disposed carrier polygonal in cross-section and defining a plurality of outwardly disposed, flat, longitudinal work engaging sides, outwardly projecting stops along each edge of each side of the carrier, a plurality of longitudinally spaced work engaging hydraulic cylinder and ram units carried by the stops along one edge of each side and disposed laterally inwardly toward and opposing the stop me ns along the other edge of each side, a central axle projecting from the opposite ends of the carrier, support means adjacent each end of the carrier and rotatably engaged with the ends of the axle to rotatably support the carrier, drive means at one end of the axle and operable to intermittently and selectively rotate the carrier a distance equal to the circumferential extent of one side of the carrier, and fluid supply means to selectively deliver fluid under pressure to and to exhaust fluid from the cylinder and ram units related to each side of the carrier, said stop means including a plurality of longitudinally spaced outwardly projecting stops along each edge portion of each side of the carrier, said cylinder and ram units including elongate cylinders arranged between and carried by adjacent pairs of stops on their related edges of the sides of the carrier, and elongate laterally inwardly projecting rams with work engaging pads at their inner ends slideably engaged in and projecting laterally inwardly from the cylinders, said fluid supply means including a multiple fluid passage fluid handling swivel coupling carried by one end of the axle, fluid lines extending between the cylinder and ram units related to each side of the carrier to related fluid passages of the swivel coupling, flow lines related to the cylinder and ram units at each side of the carrier and connected with related flow passages of the fluid coupling and extending to a station remote from the carrier, valve means related to the flow lines to direct fluid to and from the cylinder and ram units, a fluid reservoir remote from the carrier, a fluid pump remote from the carrier and connected with the reservoir, a delivery line from the pump to the valve means and a return line from the valve means to the reservoir.

5. A wood laminating press of the character referred to including, an elongate horizontally disposed box-like carrier, polygonal in cross-section and defining end walls and radially outwardly disposed side walls, an elongate tubular axle extending through and projecting from the opposite ends of the carrier, support means at each e:d of the carrier and rotatably engaging the ends of the axle to rotatably support the character, drive means at one end of the axle and operable to intermittently and selectively rotate the carrier at distance equal to the circumferential extent of one side of the carrier, stop means along and projecting outwardly from one longitudinal edge of each side wall of the carrier and adapted to engage one of the longitudinal side edges or" a stack of glued together boards arranged adjacent said side wall, a plurality of longitudinally spaced work engaging hydraulic cylinder and ram units along the other side edge of each side wall and disposed laterally inwardly toward and opposing the other side edge of said stack of glued together boards, fluid supply means to selectively deliver fluid under pressure to and to exhaust fluid from the cylinder and ram units related to each side of the carrier, and heating means to heat the stack of wood and to cure the glue including, a hot air furnace remote from the carrier, an elongate air duct extending from the furnace and swivelly connected to one end of the tubular axle to direct heated air into the axle, air ports in the axle communicating with the interior of the carrier to direct hot air into the carrier to heat 10 the side walls thereof and to heat that portion of the stacked boards adjacent the side walls, and insulated hood engaged over the carrier and openings along the edge portions of the side walls of the carrier to conduct heated air from Within the carrier into the hood to heat the other portions of the stacks of wood and to cure the glue.

References Cited UNITED STATES PATENTS 918,192 4/1904 Palmer 269-57 1,273,136 7/1918 Bergstrom 26957 1,352,501 9/1920 Carey 269-57 1,420,244 6/1922 Diehl 26957 X 1,596,117 8/1926 Pinkett 100--93 X 2,526,342 10/1950 Frisch 144281 2,675,037 4/1954 'Iglesias 100-93 X 2,725,909 12/ 1955 Sievert 269-57 X LOUIS O. MAASSEL, Primary Examiner. 

